Just tried adding a sleeping bag. I get the above message about only Mystics being able to add to the codex, and, the searching for the sleeping bag in the codex returns no hits even 5 minutes after appraising it.

Can you add a progress bar to the search screen? Once you hit submit it is chugging away in the background but the client-side UI looks like the search failed and/or is ambivalent. Once you wait long enough the results appear, but some people might get impatient and leave assuming the search is broken.